We all have problems....I have just experienced a similar problem with MCIMail.
 
I received a reject with a notation that XXXXXXX@MCIMail needed a name with the
number if if was a non-MCI Employee. That is a personal name or a company name.
 
Since I just added this person, and the address is just as the listserv "read
it on the incoming mail", how else can one address a MCI mail address on a
listserv list?
 
Any pointers appreciated.
                         John R. Stephens, Jr.(JStephen@UGA)